of this secondary radiation. In order to study the directionality of this effect, Cerenkov designed the experimental setup illustrated in Figure 2 using a conical mirror that reflected incoming radiation against a photographic plate located above a fluid-filled vessel. Photographs of the reflected light represent cases of ordinary luminescence
A sigil (/ËsÉªdÊÉl/; pl. sigilla or sigils; from Latin sigillum seal) is a symbol used in magic. The term has usually referred to a type of pictorial signature of a demon or other entity; in modern usage, especially in the context of chaos magic, it refers to a symbolic representation of the magician's desired outcome.
vigil - the rite of staying awake for devotional purposes (especially on the eve of a religious festival) watch. religious rite, rite - an established ceremony prescribed by a religion; the rite of baptism. viewing, wake - a vigil held over a corpse the night before burial; there's no weeping at an Irish wake.